302 Geological Society. 



The occurrence of an abundance of pure salt water* within the 

 area of lias, Mr. Strickland says, is an interesting phenomenon, and 

 for a solution of it, he refers to Mr. Murchison's Account of the 

 Geology of Cheltenham, p. 30. 



A paper on the high Temperature of Wells in the neighbourhood 

 of Delhi, by the Rev. Robert Everest, F.G.S., was then read. 



The country around Delhi is remarkable for its great dryness; 

 and if a line were to be drawn due west from the Jumna to the 

 Indus, a distance of 400 miles, it would intersect no river, brook or 

 spring, water being obtained only from wells. At Delhi these wells 

 are generally about 35 feet deep ; 40 or 50 miles to the westward 

 the depth is from eighty to ninety feetj and beyond that distance 

 to Hauri, 95 miles, it increases to 150 feet. Mr. Everest did not 

 visit the country further to the west, but he believes that the wells 

 have a depth of 150 feet or more. 



The soil consists of a granitic alluvium, but the surface is covered 

 in many places with saline efflorescences similar to those which the 

 floods of the Jumna now leave behind them. 



The results of the author's observations are given in the following 

 tables : — 



1. Well at Delhi, 42 feet to the bottom. This table shows the 

 amount of annual variation. 



Temp. Temp, 

 of water, of ext. air, 



1833. Nov. 12 79 



Dec. 17 76 



1834. Jan. 25 747 



Mar. 2 76-8 



Mar. 29 77 



76 

 62 

 68 

 84 

 67 



1834. 



Average temperature : water, 78-61 ; external air, 77-57. 



2. Wells to the W.S.W. of Delhi, ten to fifteen miles apart, the 

 first being the furthest, or 90 miles. 



1834. Locality. 



Jan. 



Depth Depth 



to water, of water. 



Feet. Feet. 



Toolshaum 90 7 ... 



Baphoora 52 28 ... 



Dadnee 45 15 ... 



20. Billoti 52 15 ... 



22. Djuggur 44 5 ... 



16. 

 17. 

 19. 



Total 

 depth. 



Feet. 

 .. 97 

 .. 80 

 .. 60 

 .. 67 

 .. 49 



Temp. Temp, of 

 of water, ext. air. 



82 

 82 

 81 

 81 

 77 



67 

 72 

 70 

 68 

 715 



Average 70-6 80-6 



General mean of twelve wells : depth, 96 feet ; temperature, 80°-2. 

 3. Wells situated to the west of Delhi. 



* An imperial gallon of the brine is stated to yield the following saline 



contents : — Chloride of sodium 58076 grains. 



Sulphate of lime 195-8 grains. 



Magnesia A trace. 



Dr Hastings' 's Paper in the Analyst, vol. ii. p. 384. 



